[tahoe-lafs-trac-stream] [Tahoe-LAFS] #3788: Refactor tests in test/mutable to either use sync or async base case classes.

[Tahoe-LAFS]

#3788: Refactor tests in test/mutable to either use sync or async  base case
classes.
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 Reporter:  fenn-cs  |          Owner:
     Type:  defect   |         Status:  new
 Priority:  normal   |      Milestone:  undecided
Component:  unknown  |        Version:  n/a
 Keywords:           |  Launchpad Bug:
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 Following a bunch of test refactors in #3757 & #3758 it would be great to
 have the tests in the mutable module follow same consistency level.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3788>
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